Spraying nozzles



Sept. 15, 1 TT 2,904,266

' In ventor Free e r/c A 4. 5a rf/ezt Mftomeys Sept. 15, 19 59 F. A.BARTLETT 2,904,266

SPRAYING NOZZLES Filed Aug. 2, 1956 i: 2 Sheets-Sheet 2 [Peder/6% A i z/e it B I fl /wz ?Stares finite 2,904,266 SPRAYING NOZZLES FrederickAlbert Bartlett, Baum, Cambridge, England,

assignor to Dorman Sprayer Company Limited, Ditton Walk, Cambridge,England, a Britishcompany.

Application August 2, 1956,,S'erial N 0. 601,747

Claims priority, application Great Britain August'5*, 1 955 '19 Claims.(CL. 239 553) Thisinvention relates. to spraying nozzles,.particularlyfor agricultural or horticultural spraying, and has for. an

object to provide an improved"- spraying nozzle adapted to produce abroad spray suitable for giving a wide angle;

of cover, so that it can replace a spray boomequipped with a number ofordinary spray nozzles.

In order to produce a flatspray it haspreviously been proposed toprovide a nozzle inwhich the spraying ;liq.-,

uid enters a narrow slot at approximately right. angles through a feedbore penetrating through one of the two walls of the slot, the slotthus. forming an arcuate narrow outlet around part of. the periphery ofthe nozzle. It is more particularly an object of. the presentinventionto provide .aniinproved. nozzle of this kind,,by means of whicha desirable distribution of a sprayacross. the area to be sprayed can beobtained.

According to the present invention the slot communicates with a throughbore extending a cross the nozzlesubstantially in the plane of the slot,said bore having.

a diameter which is greater than the width of theslot immediatelyadjacent tothe cross bore. Preferably the arrangement is such that thedirection .of liquid flow i11 the slot near the ends of the cross. borewill' ha've a com a spraying nozzle, which is provided with an axialfeed passage terminating in va blind end, two outlet passages extendingsubstantially radially from the feed passage to the outer peripheryofthe nozzle, and a slot interconnecting the outer ends of the twooutlet vpassagesandf penetrating into the feed passage, so as to"constitute an arcuate narrow' outlet around part of the periphery' ofthe nozzle.

From another aspect the invention provides a spray'-' ing nozzle whichis provided with a longitudinal feed passageterminating ina blind-end, atransverseslotforming' the nozzle" outlet and extending acrossth,e"fe'ed-pas*v sage, and a bore extending transversely to the-feed"passage in the plane of -the' slot, the slotpenetrating into* thesaidtransverse bore throughout "thelength thereof at one sideonly oftheaxis of the bore; The'-feedpas"- sage may be arranged to penetratethrough one wall of" the slot only, for which purpose it'shouldpreferably'be' drilled with a'flat-ended drill',.or it may penetratewith-its full diameter through both wall-s of the' slot, while ithasbeen foundliable to affect the uniformity of the spray if theboreconstituting thetfeed= passage cuts" into the second-wall of the slotwithout fully entering this walli The-nozzle may be used at aheighto'fbetwe'en' eighteen atent:

23%,25?) Patented Sept. 15-, 1 959 ice inches and about five feet abovethe ground, with the feed' passage disposed horizontally and the centreof the slot directed downwardly; according to the desired width or angleof cover the two outlet passages may be arranged diametrically oppositeto each other, so as to produce a slot extending over of the peripheryof the nozzle, or at a smaller or greater angle to each other, sothat inuse the two: holes constituting the outer edges of the spraying outletare arranged either above or below the diarnetrical axis of the tip.

Preferably the outlet passages and slot are cut at right angles to theaxis of the tip' and lie in a; common plane.

In order that. the invention may be more fully under stoodg. referencewill now be made to the accompanying drawings, in which:

Figs. '1' and: 2 are respectively a cross section and fragmentary axialsection of one form of nozzle according to the invention takenrespectively along line II of Fig. 2' and line 'I=I-II of Fig. 1,

Fig; 3' is' a fragmentary axial section of a' modified nozzle;

Fig. 4 is a fragmentary axial section of afurther form of nozzle, and

Figs; 5 and: 6' are respectively a cross section and a fragmentaryaxialsection of yet a further modified form of nozzle, Fig. 5' being a crosssection along line VV of Fig. 6:.

Referring. now first to Figs. 1 and 2, the nozzle 1 is cylindrical: andhas an axial bore 2 to which the spraying-i-liquid' is supplied underpressure. at. itsouter'end and is shown as a blind bore, although itobviously may alternatively, if desired, be drilled as a through boreandtitsouter end closed by a screw-in plug or the like. The blind end ofthe bore is designated by 3*. Drilled radially into the nozzle in acommon plane near the blind end 3 of the bore are two cylindricaloutlet. :passagesd; and a narrow slot '5 of narrow-angle V;- profile iscut into the outer circumference of the nozzle int-such: manner as topenetrate into the radial bores 4 adjacent their outer ends while at thesame time penetrating the central feed passage 2. This may be done bypassing: a. suitable: millingi cutter? of. narrow-angle V-profile acrossthe nozzle tip 1 along a circular path of suitably largerradius, or thecutter maybe passed across the tip three'ati'mes: in straight paths; forexample, referring to Fig: .lgufirst in the slightly inclined path '6 toproduce the leftshand inclined portion of the slot, then back in a path7. .inclined in the opposite direction, to produce the right-hand pathof the slot, and finally horizontally as shown? at. 8 at such a heightthat it will slightly penetrate into thetcentral passage 2 whenproducing the central portion. ofthe slot.

.It has been found that with a nozzle according to thewinventionarranged at a height of eighteen inches to five: feet. above the ground,having the passage 2 horizoirtal' and the slot 5 directed verticallydownwardly, a broad spray'is obtained in which the distribution of thespray is ofsatisfactory uniformityover' the width of the sprayed; swathand that the drop sizes of the spray di-- rected'. to the outer ends ofthe swath was larger than that directed to points near the centre, so asto reduce dllftaof'gthe spray in windy weather.

Various details ofthe nozzle may be varied without exceeding the scopeof the invention. Thus, while the two outlet passages 4 have been shownas drilled diametricallyopposite to each-other they may alternatively bedrilled toenclose anangle smaller or greater than 180.

In apracticalembodiment of the nozzle as described, which was found tosupply a very satisfactory broad spray- .when ,used at a liquid pressurebetween 30 and 40" po11nds per square inch, vand to deliver liquidpnderthese conditions at a rate of about 1 /2 gallons per acre This bore isclosed' 3 at a speed of about mph, the outside diameter of the nozzlewas inch, the diameter of the feed bore 2 was inch that of the crossbore 4 was .027 inch while the width of the slot 5 at its narrowest partwas 0.01 inch and its flare angle Was 5".

In the modified nozzle according to Fig. 3 the feed passage 12 in thebody is drilled with a flat-ended drill, so as not to foul the outerside of the slot 15. This slot has parallel walls and is cut in astraight line across the nozzle to a depth beyond the central feedpassage 12, where it penetrates one side of a transverse bore 14throughout the length thereof. The diameter of the bore 14 is somewhatgreater than the width of the slot 15, and while the slot penetratesinto the bore throughout the length thereof at one side of the axis ofthe bore, it does not enter into the wall of the bore 14 at the oppositeside of this axis. The feed passage 12 has a wider portion 12a at itsend where it is connected to the supply line for the spraying liquid. Anozzle of this form was made with the diameter of the feed passage 12equal to A inch, the diameter of then transverse bore equal to 0.03inch, and the width of the slot equal to 0.02 inch,

and when used with a knapsack type sprayer at an.

operating speed of two miles per hour and at an operating pressure of 30pounds per square inch it was found to apply approximately 1 /2 gallonsper acre over a width of approximately 21 feet.

In a further form of the invention shown in Fig. 4, the spray nozzlecomprises a body 20 provided with a central feed passage 22communicating with the slot 25 and the transverse bore 24. The slot hasparallel walls, and the central feed passage is drilled with a flatended drill whereby it can be arranged only to penetrate one side of theslot and the transverse bore. In order that the nozzle may handle alarger capacity of spraying liquid a separate feed passage 29 isprovided for feeding.

the transverse bore 24. The feed passages 22 and 29 both communicatewith the chamber 21.

In one nozzle constructed as above described the slot 25 has a width ofinch, the main feed passage 22 has a diameter of inch, and the separatefeed passage 29 has a diameter of inch, as does also the transverse bore24. When used at a pressure of 40 pounds per square inch, this nozzle iscapable of delivering spraying liquid at a rate of ten gallons per acregiving a spray width of 30 feet and at an operating speed of five milesper hour.

In yet a further embodiment of spray nozzle according to the invention,shown in Figs. 5 and 6, there is provided a nozzle body 30 having acentral feed passage 32 feeding a parallel-sided slot 35 and a separatefeed passage 39 feeding a transverse bore 34. The feed passages 32 and39 both communicate with the chamber 31. This nozzle also incorporates afurther feature in the form of a short bridge 33 arranged across thecentre of the transverse hole. The purpose of the bridge 33 is toprevent interference with the flow of liquid in the transverse bore 34by the liquid emerging from the slot 35, within the confines of thenozzle and enables the spray width of the nozzle to be increased fromapproximately 30 feet without the bridge to approximately 45 feet withthe bridge when fed with spraying liquid at a pressure of 40 pounds persquare inch. The central feed passage 32 in this form of the inventionmay have a diameter of inch, the separate feed passage 39 may have adiameter of A3 inch, which is also the diameter of the transverse bore35, and the slot 34 may have a width of & inch.

The nozzles according to this invention have been found not only toensure satisfactory uniform spray intensity over the whole spray widthbut it has been found that in addition the droplets reaching theoutermost parts of the spray width are larger in an average than thedroplets sprayed to the central parts of the spray width, a featurewhich is of advantage under windy conditions,

because the larger droplets are less liable to drift in the Wind.

The desirable distribution of spray achieved by nozzles of the presentinvention is believed to be due to the combined action of the jetissuing from the transverse bore or bores with the radial flow throughthe slot impinging on this jet, resulting in a certain breaking up ofthe jet stream and the formation of droplets of a smaller size thanwould otherwise be obtained. The nozzles according to the invention maybe adapted to different spray widths by varying the proportions of thewidth of the slot and diameter of the transverse bore and it will beunderstood that the dimensions given above are only by way of example.

I claim:

1. A spray nozzle comprising a nozzle body having a feed passageterminating in a blind end, said nozzle body having a slot transverse tothe feed passage and extending at least part Way across said feedpassage, said nozzle body further having a bore also extendingtransversely to the feed passage situated substantially in the plane ofthe slot and having a diameter which is greater than the width of theslot immediately adjacent to the transverse bore, said transverse borebeing in communication with the slot and the feed passage.

2. A'spray nozzle comprising a nozzle body having an axial feed passageterminating in a blind end, said nozzle body having a transverse bore inthe form of two outlet 1 passages extending substantially radially fromthe feed as to constitute an arcuate narrow outlet around part of theperiphery of the nozzle.

3. A spray nozzle comprising a nozzle body having a longitudinal feedpassage terminating in a blind end, said nozzle body having a transverseslot forming the nozzle outlet and extending at least part way acrossthe feed passage said nozzle body further having a bore extendingtransversely to the feed passage substantially in the plane of the slot,and communicating with the slot throughout at least part of the lengthof the slot.

4. A spray nozzle as claimed in claim 3, in which the transverse bore isarranged at the inner end of the slot.

5. A spray nozzle as claimed in claim 3, in which the surfaces of thenozzle body defining the walls of the slot are parallel.

6. A spray nozzle as claimed in claim 3, in which the transverse bore isformed as an angular passage.

7. A spray nozzle as claimed in claim 3, in which the nozzle body alsohas a separate feed passage to the transverse bore.

8. A spray nozzle as claimed in claim 3, in which a bridge piece isarranged across the centre of the transverse bore to preventinterference with the flow of liquid in the bore by the liquid emergingfrom the slot.

9. A spray nozzle as claimed in claim 3, in which the transverse boreand the slot are cut at right angles to the axis of the tip of thenozzle and lie in a common plane.

10. A spray nozzle as claimed in claim 3, in which the feed passagecomprises a wider portion adjacent the liquid inlet end of the nozzlebody and a narrower portion between the wider portion and the slot.

11. A spray nozzle comprising a generally cylindrical nozzle body havinga feed passage extending longitudinally of said nozzle body andterminating in a blind end, said nozzle body having a slot forming thenozzle outlet located around part of the periphery of the nozzle bodyand extending substantially transversely to and at least part way acrossthe feed passage, said nozzle body further having a bore extendingtransversely to the feed passage substantially in the plane of the slot,said bore being of ing with the slot throughout at least part of thelength of the slot.

12. A spray nozzle comprising a nozzle body having a feed passageterminating in a blind end, said nozzle body having a slot forming thenozzle outlet located around part of the nozzle body and extending atleast part Way across the feed passage, said nozzle body further havinga bore extending transversely to the feed passage substantially in theplane of the slot, said bore being of smaller diameter than the feedpassage and communicating with the slot throughout at least part of thelength of the slot.

13. A spray nozzle as claimed in claim 12, in which the feed passagecomprises a wider portion adjacent the liquid inlet end of the nozzlebody and a narrow portion between the wider portion and the slot.

14. A spray nozzle comprising a generally horizontallyarrangedcylindrical nozzle body having a horizontal axial feed passage extendinglongitudinally of said nozzle body and terminating in a blind end, saidnozzle body having a vertical slot forming the nozzle outlet locatedaround part of the periphery of the nozzle body and extendingtransversely to and at least part way across the feed passage, saidnozzle body further having a horizontal bore extending transversely tothe feed passage substantially in the plane of the slot, said bore beingof smaller diameter than the feed passage and communicating with theslot throughout at least part of the length of the slot.

15. A spray nozzle comprising a nozzle body having a feed passageterminating in a blind end, said nozzle body having a parallel sidedslot forming the nozzle outlet located around part of the nozzle bodyand extending transversely to and at least part way across the feedpassage, said nozzle body further having a bore extending transverselyto the feed passage substantially in the plane of the slot, said borebeing of smaller diameter than the feed passage and communicating withthe slot substantially throughout the length of the slot.

16. A spray nozzle comprising a generally cylindrical nozzle body havinga feed passage extending longitudinally of said nozzle body andterminating in a blind end, said nozzle body having a slot forming thenozzle outlet located around part of the periphery of the nozzle bodyand extending substantially transversely to and at least part way acrossthe feed passage, said nozzle body further having a bore extendingtransversely to the feed passage substantially in the plane of the slot,said bore being of smaller diameter than the feed passage andcommunicating with the slot throughout at least part of the length ofthe slot and said nozzle body also having a second feed passageconnected to said transverse bore.

17. A spray nozzle as claimed in claim 16, in which a bridge piece isarranged at the centre of the transverse bore to prevent interferencewith the liquid flow in the bore by the liquid emerging from the slot.

18. A spray nozzle comprising a nozzle body having a feed passageterminating in a blind end, said nozzle body having a parallel sidedslot forming the nozzle outlet located around part of the nozzle bodyand extending transversely to and at least part way across the feedpassage, said nozzle body further having a bore extending transverselyto the feed passage substantially in the plane of the slot, andcommunicating with the slot throughout at least part of the length ofthe slot and said nozzle body also having a second feed passageconnected to said transverse bore.

19. A spray nozzle comprising a nozzle body having a feed passageterminating in a blind end, said nozzle body having a slot forming thenozzle outlet located around part of the nozzle body and extendingsubstantially transversely to and across the feed passage, said nozzlebody further having a bore extending transversely to the feed passagesubstantially in the plane of the slot, said bore communicating with theslot throughout at least part of the length of the slot, and said nozzlebody also having a second feed passage connected to said transverse boreand a bridge piece arranged at the centre of the transverse bore.

References Cited in the file of this patent UNITED STATES PATENTS614,194 Wilgus NOV. 15, 1898 1,092,674 Tinkhans Apr. 7, 1914 FOREIGNPATENTS 572,854 Great Britain Oct. 26, 1945

